as 用法总结连词：1.正如……引导非限制性定语从句，放句首As is said/known/ reported/believed/told, ……..As is often the case,…..这是常有的事As the saying goes, no pains, no gains.as expected/supposed than expected/supposed as usual than usualsuch…..that …..cf: such…..as……such/so…..that….引导结果状语从句如此…..以致于such/so…..as …...引导定语从句，as为六代之一，充当成分e.g. It is such a heavy box that we can’t lift it.It is such a heavy box as we can’t lift.Such a heavy box is it that we can’t lift it.the same + n. that 同一物（定语从句）the same + n. as 相似物（定语从句）I am wearing the same cap as you did yesterday.今天我戴了一顶和你昨天戴的一样的帽子。
e.g. I don’t like playing basketball, but my brother likes. 错误like 是vt，后面必须加宾语，but my brother likes playing basketball.改为：but my brother does. 助动词相当于一个动词词组2. 正如，依照，按照……I will do as you advised. 我会照您的建议去做。
She stayed in bed as the doctor had ordered.她依照医生的吩咐卧床休息。
Leave it as it is. 把它维持原样。
cf：what“那个样”Alice isn’t what she was.Alice is 3 times what she was 6 years ago.3. 尽管（as 须倒装，though 可倒装，although 不可倒装）方法：将表语提前，名词前去冠词Boy as/though he is，he knows a lot.尽管while in spite of = despitee.g. While he is of much wealth, he is not happy.( of much wealth富有的)while 用法1.并列连词，而，然而cf：but 然而，但是，表转折e.g.I was reading in the sitting room, while my brother was playing agame in his bedroom.2.当…….的时候while + 进行时cf when + 点动作cf as 一边……一边，同时e.g. While they were talking about me, I pushed in. （考：while + V-ing）When I pushed in, they were talking about me.3. while 尽管（考：选择while）4. 随着……, 一边…..一边，同时，持续性动词As time goes on/by, ……随着时间的推移，（goes 是谓语，需要as 连词）With time going on/by,…随着时间的推移，（going是非谓语，需要with介词）选择题：①题目中出现goes 或going，考as或with②题目中出现as 或with，考goes或going，常考with + 宾语+ goingHe sang songs as he was taking a bath. 他一面洗澡，一面唱歌。
He was watching TV in the sitting room while I was playing games in my bedroom.5. as正因为（强有力，唯一的理由）e.g. He won the first prize in the competition, as he worked so hard for it. because 普通的因果关系now that= since 既然e.g. Now that everybody is here, let’s begin our meeting.for 表示猜测.e.g. It rained last night, for the ground is wet now.介词：1. 作为work as/ serve as/ act as 充当，充任act as a leading role/part in the film扮演主角play a leading part/role in doing sth 在做某事过程中起主导作用cf: work for 为……效力，工作be used to doing= be accustomed to doing sth 习惯于be used to do/as/for 被用来做，被用作为，被用于used to do =would do 过去常常做（used to 实义动词或助动词）e.g. There used to be a wasteland here, didn’t there?或usedn’t there?cf: used to doing 是be used to doing 的非谓语形式“习惯于……的”used to do 是be used to do 的非谓语形式“被用来做……的”选择题：方法：判断是否非谓语，主动还是被动，要做正在做还是做完了2. treat / look on / think of/ count/ regard/……sb as 把…..当作consider sb (as/to be) 认为某人是，把…..当作cf：consider sb to do 认为某人要做某事consider one’s doing= think of one’s doing考虑某人做某事consideration 考虑under consideration 在考虑中under way 在进行中under repair 在修理中With my bike being repaired/ under repair，would you be so kind to lend me yours?under construction 在建造中under attack 遭受攻击under discussion 在讨论中considerate adj = thoughtful 考虑周到的，体贴的副词：as ……as 和……一样not as/so ……asHe is as honest a boy as me.He is not as/so honest a boy as me.（说明：第一个as/so是副词，第二个as为介词或连词）This building is as tall as that one.This building is twice as tall as that one.It is twice as tall a building as that one.He is older than me .He is much older than me.He is twenty-four years older than me.He is twice older than me.It is a building.It is a tall building.It is as tall as that building.It is as tall a building as that one.It is twice as tall a building( as that one).考试时考：1.twice as tall a building as2.twice as tall a building.(后面省略)such a good boy= so good a boyI feel so upset for(介词) my not being as gifted in English as you (are).be gifted/talented in 在某方面有天赋倍数关系：36与12的关系：36=3*12（①12即as old as me②我的年龄the age of me）1.three times as old as me (=three times as old a boy as me)2.twice older than me (36-12)/12=23.three times the age of me4.three times that of me (that/those指代比较对象)5.three times what she was 6 years ago.其它词组搭配：as long as只要/so long asas far as远至As far as I’m concerned,…=From my point of view,=In my opinion,=As for me, as soon as possible=as soon as sb can尽快离动作发生的时间短e.g. He spent as much time as he could working hard.他花尽可能多的时间努力学习。
as fast as possible 对象移动的快as quickly as possible 动作发生的快as well as 也，和= together with = along with=with 就前原则，考谓语单数as if= as though似乎，好像cf：even if = even though 即使as for/to me 对我来说How soon……?表示离动作发生还有多久（瞬间动词）I will get there in 2 days. How long……?表示动作持续了多久（持续性动词）I will stay there for 2 days. How often……?(表示怎么个经常法)提问频率。